[Dual Mode]: This voltage detector pen is designed with automatic and manual mode according to your needs. It is convenient to detect and indicate the presence of AC voltage in automatic mode, and allows better use in complex environments in manual mode. [Sensitivity [Adjustable Free]: Sensitivity The voltage of this electrical voltage detector can be adjusted to any specification. any value according to your needs. It can more accurately find the firewire in a cluttered pile of cables. [Audible and visual alarm]: The 12v voltage detector has 8 LED indicators in 3 colors (2 green, 3 yellow and 3 red). Thanks to automatic switching on of different colors & LED numbers and alarm With different frequencies, you can easily and visually assess the voltage. [Checking live wire]: Safe and easy to test. distinguish the live wire by evaluating the current of the detected voltage, the line with the strongest voltage signal is a live wire. [Find break point]: Find the break point of the live line by measuring the change in tension of the live wire.